效果图：
<a href="#"> <div class="jqthumb" style="width: 200px; height: 200px; opacity: 1;"> <div style="width: 100%; height: 100%; border-radius: 100%; margin: 3px auto; cursor: pointer; transition: all 0.4s ease-in-out; transform: scale(1); background-image: url("http://img.woyaogexing.com/2016/12/29/5f54545463bff6f8!200x200.jpg"); background-size: cover; background-position: 50% 50%; background-repeat: no-repeat;"></div> </div> <img src="http://img.woyaogexing.com/2016/12/29/5f54545463bff6f8!200x200.jpg" style="display: none;"> </a>
原文：http://www.cnblogs.com/moumou0213/p/6413370.html